:root {
  --ink: #173c35;
  --ink-deep: #0d2924;
  --paper: #f4f0e7;
  --paper-warm: #eae3d5;
  --card: #fbf9f4;
  --line: rgba(23, 60, 53, 0.17);
  --muted: #6f776f;
  --focus: #f5b642;
  --shadow: 0 24px 70px rgba(13, 41, 36, 0.1);
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink-deep);
  background:
    radial-gradient(circle at 87% 9%, rgba(67, 139, 117, 0.12), transparent 23rem),
    linear-gradient(180deg, #f7f4ed 0, var(--paper) 42rem);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

button,
.stem {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 1rem;
  left: 1rem;
  padding: 0.75rem 1rem;
  color: #fff;
  background: var(--ink);
  border-radius: 999px;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header,
.intro,
.style-rail,
.workspace {
  width: min(1440px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 52px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  gap: 13px;
  align-items: center;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: var(--paper);
  background: var(--ink);
  border-radius: 50% 50% 43% 57%;
  font-family: Georgia, serif;
  font-size: 1.2rem;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  letter-spacing: -0.02em;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.offline-badge {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.offline-badge i {
  width: 8px;
  height: 8px;
  background: #55a47f;
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(85, 164, 127, 0.13);
}

.intro {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.6fr);
  gap: 40px;
  align-items: end;
  padding-block: clamp(68px, 10vw, 150px) clamp(48px, 8vw, 100px);
}

.intro::after {
  position: absolute;
  z-index: -1;
  top: 25%;
  right: 8%;
  width: 170px;
  height: 88px;
  content: "";
  border: 1px solid var(--line);
  border-radius: 50%;
  transform: rotate(-9deg);
}

.eyebrow,
.panel-label {
  margin: 0 0 13px;
  color: #698078;
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.intro h1 {
  max-width: 900px;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(3.2rem, 7.5vw, 7.7rem);
  font-weight: 400;
  letter-spacing: -0.065em;
  line-height: 0.91;
}

.intro h1 em {
  color: #4d796b;
  font-weight: 400;
}

.intro-copy p {
  max-width: 32rem;
  margin: 0 0 0.8rem;
  color: #596861;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  line-height: 1.55;
}

.style-rail {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-block: 1px solid var(--line);
}

.style-rail button {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px;
  cursor: pointer;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-right: 1px solid var(--line);
  transition: color 180ms ease, background 180ms ease;
}

.style-rail button:last-child {
  border-right: 0;
}

.style-rail button span {
  font-family: Georgia, serif;
  font-size: 0.76rem;
  font-style: italic;
}

.style-rail button:hover,
.style-rail button[aria-pressed="true"] {
  color: var(--paper);
  background: var(--ink);
}

.workspace {
  position: relative;
  padding-block: 12px 72px;
}

.workspace-toolbar {
  position: sticky;
  z-index: 30;
  top: 0;
  display: grid;
  grid-template-columns: minmax(420px, 1fr) auto auto;
  gap: 12px;
  align-items: stretch;
  margin-bottom: 12px;
  background: rgba(244, 240, 231, 0.97);
  backdrop-filter: blur(12px);
}

.workspace-toolbar .style-rail {
  width: 100%;
  margin: 0;
}

.workspace-context {
  display: grid;
  min-width: 170px;
  align-content: center;
  padding-inline: 8px;
}

.workspace-context .eyebrow,
.workspace-context .mood {
  margin: 0;
  padding: 0;
  text-align: left;
  white-space: nowrap;
}

.workspace-context h2 {
  margin: 2px 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1;
}

.workspace-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.mode-switch {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  background: var(--paper-warm);
  border-radius: 999px;
}

.mode-switch button {
  min-width: 104px;
  padding: 10px 18px;
  cursor: pointer;
  background: transparent;
  border: 0;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.mode-switch button[aria-pressed="true"] {
  color: var(--paper);
  background: var(--ink);
  box-shadow: 0 7px 20px rgba(13, 41, 36, 0.18);
}

.orientation-toggle,
.new-arrangement {
  min-height: 44px;
  padding: 9px 14px;
  cursor: pointer;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 800;
  white-space: nowrap;
}

.orientation-toggle[aria-pressed="true"] {
  color: var(--paper);
  background: var(--ink);
  border-color: var(--ink);
}

.orientation-compact,
.new-arrangement-compact {
  display: none;
}

.workspace-heading {
  display: flex;
  gap: 30px;
  align-items: end;
  justify-content: space-between;
  margin: 52px 0 34px;
}

.workspace-heading h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.7rem, 6vw, 5.8rem);
  font-weight: 400;
  letter-spacing: -0.055em;
  line-height: 0.9;
}

.mood {
  max-width: 250px;
  margin: 0;
  padding-bottom: 5px;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.09em;
  text-align: right;
  text-transform: uppercase;
}

.construction {
  display: grid;
  grid-template-columns: minmax(170px, 0.3fr) minmax(0, 1fr);
  gap: 22px 42px;
  align-items: center;
  margin-bottom: 24px;
  padding: 22px 26px;
  background: rgba(255, 255, 255, 0.38);
  border: 1px solid var(--line);
  border-radius: 20px;
}

.construction .panel-label,
.construction strong {
  display: block;
  margin: 0;
}

.construction strong {
  margin-top: 4px;
  font-family: Georgia, serif;
  font-size: 1.35rem;
  font-weight: 400;
}

#construction-step {
  width: 100%;
  accent-color: var(--ink);
}

.step-dots {
  display: grid;
  grid-column: 2;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  color: var(--muted);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  text-align: center;
  text-transform: uppercase;
}

.step-dots span {
  display: grid;
  gap: 5px;
  justify-items: center;
}

.step-dots i {
  display: grid;
  width: 20px;
  height: 20px;
  place-items: center;
  color: var(--paper);
  background: var(--ink);
  border-radius: 50%;
  font-family: Georgia, serif;
  font-style: normal;
}

.view-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
}

.view-card {
  min-width: 0;
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 26px;
  box-shadow: 0 9px 35px rgba(13, 41, 36, 0.045);
}

.view-card header {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 18px 20px 0;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.view-card header span {
  color: #a89778;
  font-family: Georgia, serif;
  font-size: 0.76rem;
  font-style: italic;
}

.hero-view {
  background: var(--ink);
}

.hero-view header {
  color: rgba(244, 240, 231, 0.82);
}

.shared-views .hero-view .stem text,
.shared-views .hero-view .view-caption {
  fill: #fff1c9;
}

.diagram {
  display: grid;
  aspect-ratio: 1 / 0.92;
  place-items: center;
  padding: 8px;
}

.diagram svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.container-shape,
.container-profile,
.container-rim,
.container-sidewall,
.container-base {
  fill: rgba(67, 139, 117, 0.08);
  stroke: #8da49b;
  stroke-width: 0.7;
}

.container-sidewall,
.container-base {
  fill: none;
}

.hero-view .container-shape,
.hero-view .container-profile,
.hero-view .container-rim,
.hero-view .container-sidewall,
.hero-view .container-base {
  fill: rgba(244, 240, 231, 0.05);
  stroke: rgba(244, 240, 231, 0.45);
}

.hero-view .container-sidewall,
.hero-view .container-base {
  fill: none;
}

.water-fill {
  fill: rgba(107, 165, 165, 0.16);
  stroke: rgba(107, 165, 165, 0.45);
  stroke-width: 0.5;
}

.water-line {
  fill: none;
  stroke: rgba(107, 165, 165, 0.45);
  stroke-width: 0.5;
  stroke-dasharray: 2 2;
}

.stem {
  cursor: pointer;
  opacity: 0.56;
  transition: opacity 180ms ease;
}

.stem:hover,
.stem.is-focused {
  opacity: 1;
}

.stem line {
  stroke: var(--stem);
  stroke-width: 1.8;
  stroke-linecap: round;
  filter: drop-shadow(0 2px 2px rgba(13, 41, 36, 0.12));
}

.stem circle {
  fill: var(--stem);
  stroke: var(--card);
  stroke-width: 1.5;
}

.hero-view .stem circle {
  stroke: var(--ink);
}

.hero-view .stem .insertion-point {
  fill: var(--stem);
  stroke: #fff1c9;
  stroke-width: 1.6;
}

.hero-view .stem .vertical-cue {
  fill: #fff1c9;
  font-size: 2.3px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.stem text {
  fill: var(--stem);
  font-size: 5px;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.shared-views .stem text,
.view-caption {
  fill: #46534d;
  font-size: 4px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.reading-panel,
.reference-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 14px;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 26px;
}

.reading-panel > div,
.reference-panel > div {
  padding: clamp(25px, 4vw, 48px);
  background: var(--card);
}

.reading-panel p,
.reference-panel p {
  max-width: 47rem;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1.05rem, 1.5vw, 1.3rem);
  line-height: 1.55;
}

.reading-panel .insight {
  color: var(--paper);
  background: #315f53;
}

.insight .panel-label {
  color: #b9cfc6;
}

.reference-panel {
  grid-template-columns: minmax(250px, 0.35fr) minmax(0, 1fr);
}

.reference-teaching-note {
  display: grid;
  gap: 24px;
  align-content: start;
  padding: clamp(25px, 4vw, 48px);
  color: var(--paper);
  background: var(--ink);
  border: 1px solid var(--ink);
}

.reference-teaching-note .panel-label {
  margin: 0;
  color: #b9cfc6;
}

.reference-teaching-note section {
  display: grid;
  gap: 8px;
}

.reference-teaching-note h3 {
  margin: 0;
  color: #fff1c9;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.25rem;
  font-weight: 400;
}

.reference-panel .reference-teaching-note p {
  margin: 0;
  color: #d5e1dc;
  font-family: inherit;
  font-size: 0.88rem;
  line-height: 1.55;
}

.table-wrap { overflow-x: auto; }

.reference-panel table {
  width: 100%;
  min-width: 530px;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.reference-panel th,
.reference-panel td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.reference-panel thead th {
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.reference-panel tbody th i {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 9px;
  background: var(--stem);
  border-radius: 50%;
}

.start-guide {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  margin-top: 18px;
  padding: 13px 18px;
  color: #fff;
  background: var(--ink);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

@media (max-width: 900px) {
  .intro {
    grid-template-columns: 1fr;
  }

  .intro-copy {
    margin-top: 10px;
  }

  .view-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-view {
    grid-column: 1 / -1;
  }

  .hero-view .diagram {
    aspect-ratio: 1.7 / 1;
  }
}

@media (max-width: 700px) {
  .site-header,
  .intro,
  .style-rail,
  .workspace {
    width: min(100% - 28px, 1440px);
  }

  .site-header {
    min-height: 52px;
  }

  .offline-badge {
    font-size: 0;
  }

  .offline-badge i {
    width: 10px;
    height: 10px;
  }

  .intro {
    grid-template-columns: 1fr;
    gap: 28px;
    padding-block: 72px 58px;
  }

  .intro h1 {
    font-size: clamp(3rem, 15vw, 5.4rem);
  }

  .workspace {
    padding-block: 8px 78px;
  }

  .workspace-toolbar {
    grid-template-columns: 1fr auto;
    gap: 8px;
    margin-bottom: 8px;
  }

  .workspace-toolbar .style-rail {
    grid-column: 1 / -1;
  }

  .workspace-context {
    display: none;
  }

  .workspace-context .eyebrow,
  .workspace-context .mood {
    display: none;
  }

  .workspace-context h2 {
    font-size: 1.25rem;
  }

  .workspace-actions {
    gap: 6px;
  }

  .mode-switch {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .mode-switch button {
    min-width: 0;
    padding: 8px 10px;
  }

  .orientation-toggle,
  .new-arrangement {
    padding: 0 9px;
  }

  .orientation-wide,
  .new-arrangement-wide {
    display: none;
  }

  .orientation-compact,
  .new-arrangement-compact {
    display: inline;
  }

  .mood {
    margin-top: 15px;
    text-align: left;
  }

  .construction {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .step-dots {
    grid-column: 1;
    overflow: hidden;
  }

  .step-dots span {
    font-size: 0;
  }

  .view-grid,
  .reading-panel,
  .reference-panel {
    grid-template-columns: 1fr;
  }

  .hero-view {
    grid-column: auto;
  }

  .hero-view .diagram,
  .diagram {
    aspect-ratio: 1 / 0.88;
  }

  .view-card,
  .reading-panel,
  .reference-panel {
    border-radius: 20px;
  }
}

.lesson-board {
  display: grid;
  gap: 18px;
  margin-bottom: 18px;
}

.lesson-board-header,
.teacher-setup,
.stem-bench,
.teacher-check {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 26px;
}

.lesson-board-header {
  display: flex;
  gap: 32px;
  align-items: end;
  justify-content: space-between;
  padding: clamp(28px, 5vw, 58px);
  color: var(--paper);
  background: var(--ink-deep);
}

.lesson-board-header h3 {
  max-width: 820px;
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 4.4vw, 4.4rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.lesson-board-header h3 em {
  color: #9dc7b8;
  font-weight: 400;
}

.lesson-board-header .eyebrow {
  color: #9dc7b8;
}

.lesson-progress {
  display: grid;
  min-width: 145px;
  gap: 4px;
  justify-items: end;
  padding-bottom: 5px;
}

.lesson-progress span {
  font-family: Georgia, serif;
  font-size: 2.2rem;
}

.lesson-progress small {
  color: #9dc7b8;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.teacher-setup {
  padding: clamp(24px, 3vw, 38px);
  background: var(--card);
}

.setup-heading,
.setup-actions,
.stem-bench-heading,
.check-heading {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}

.setup-heading h4,
.stem-bench h4,
.teacher-check h4 {
  margin: 0;
  font-family: Georgia, serif;
  font-size: clamp(1.55rem, 2.4vw, 2.3rem);
  font-weight: 400;
}

.quiet-button,
.text-button,
.orientation-control,
.checkpoint-grid button,
.next-stem {
  cursor: pointer;
}

.quiet-button,
.text-button {
  padding: 10px 14px;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.setup-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(130px, 0.75fr)) minmax(220px, 1.25fr);
  gap: 12px;
  margin-top: 28px;
}

.setup-grid label,
.override-field {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.setup-grid input,
.setup-grid select,
.override-field input {
  width: 100%;
  min-height: 54px;
  padding: 10px 14px;
  color: var(--ink-deep);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 1.05rem;
  font-weight: 650;
}

.teacher-setup.is-locked input,
.teacher-setup.is-locked select {
  color: var(--muted);
  background: var(--paper);
}

.orientation-control {
  display: grid;
  gap: 2px;
  align-content: center;
  min-height: 78px;
  padding: 12px 17px;
  text-align: left;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.orientation-control span,
.orientation-control small {
  color: var(--muted);
  font-size: 0.65rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.orientation-control strong {
  font-family: Georgia, serif;
  font-size: 1.15rem;
  font-weight: 400;
}

.setup-actions {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.setup-actions p {
  display: flex;
  gap: 9px;
  align-items: center;
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
}

.setup-actions p i {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--focus);
  border-radius: 50%;
}

.stem-bench {
  padding: clamp(24px, 3vw, 38px);
  background: #ede7db;
}

.stem-bench-heading > div {
  display: flex;
  gap: 16px;
  align-items: center;
}

.role-number {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  color: #fff;
  background: var(--role-color);
  border-radius: 50%;
  font-family: Georgia, serif;
  font-size: 1.25rem;
}

.stem-bench-heading > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.assembly-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.assembly-card {
  min-width: 0;
  padding: clamp(20px, 2.5vw, 32px);
  background: var(--card);
  border: 1px solid rgba(23, 60, 53, 0.11);
  border-radius: 20px;
}

.assembly-step {
  color: var(--role-color);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.assembly-card h5 {
  margin: 9px 0 24px;
  font-family: Georgia, serif;
  font-size: clamp(1.3rem, 2vw, 1.8rem);
  font-weight: 400;
}

.assembly-card > p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.55;
}

.large-value {
  display: flex;
  gap: 7px;
  flex-direction: column;
  margin-bottom: 22px;
}

.large-value > span {
  font-family: Georgia, serif;
  font-size: clamp(2.2rem, 4vw, 3.8rem);
  letter-spacing: -0.04em;
}

.large-value small {
  width: fit-content;
  padding: 5px 8px;
  color: #315f53;
  background: #dce9e3;
  border-radius: 999px;
  font-size: 0.62rem;
  font-weight: 750;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.large-value small[data-status="teacher-adjusted"] {
  color: #714f11;
  background: #f5e2aa;
}

.override-field {
  position: relative;
}

.override-field span {
  position: absolute;
  right: 13px;
  bottom: 17px;
  color: var(--muted);
  font-size: 0.72rem;
}

.kenzan-card svg {
  display: block;
  width: min(100%, 280px);
  margin: -8px auto 0;
}

.kenzan-disc {
  fill: #d9d4c8;
  stroke: #87887d;
  stroke-width: 1;
}

.kenzan-pins circle {
  fill: #6c7069;
}

.kenzan-target {
  fill: color-mix(in srgb, var(--role-color) 30%, transparent);
  stroke: var(--role-color);
  stroke-width: 2.5;
}

.front-marker {
  fill: none;
  stroke: var(--focus);
  stroke-width: 1.4;
}

.front-label {
  fill: #fff1c9;
  font-size: 4px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.angle-reading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2px 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.angle-reading span,
.angle-reading small {
  color: var(--muted);
  font-size: 0.7rem;
}

.angle-reading strong {
  grid-row: 1 / span 2;
  grid-column: 2;
  color: var(--role-color);
  font-family: Georgia, serif;
  font-size: 2.2rem;
  font-weight: 400;
}

.teacher-check {
  display: grid;
  grid-template-columns: minmax(210px, 0.7fr) minmax(0, 1.3fr);
  gap: 28px;
  padding: clamp(24px, 3vw, 38px);
  background: var(--card);
}

.check-heading {
  display: block;
}

.check-heading p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.5;
}

.checkpoint-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.checkpoint-grid button {
  display: grid;
  min-height: 92px;
  gap: 8px;
  place-items: center;
  padding: 12px 8px;
  color: var(--muted);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  font-size: 0.67rem;
  line-height: 1.25;
  text-align: center;
}

.checkpoint-grid button i {
  display: grid;
  width: 24px;
  height: 24px;
  place-items: center;
  color: transparent;
  border: 1px solid #9aa49f;
  border-radius: 50%;
  font-style: normal;
}

.checkpoint-grid button[aria-pressed="true"] {
  color: var(--ink);
  background: #e2ece7;
  border-color: #a9c4b9;
}

.checkpoint-grid button[aria-pressed="true"] i {
  color: #fff;
  background: var(--ink);
  border-color: var(--ink);
}

.next-stem {
  grid-column: 1 / -1;
  min-height: 58px;
  color: #fff;
  background: var(--ink);
  border: 0;
  border-radius: 14px;
  font-weight: 750;
  letter-spacing: 0.03em;
}

.shared-views {
  margin-top: 18px;
}

@media (max-width: 900px) {
  .setup-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .assembly-grid {
    grid-template-columns: 1fr 1fr;
  }

  .length-card {
    grid-column: 1 / -1;
  }

  .teacher-check {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .lesson-board-header,
  .setup-heading,
  .setup-actions,
  .stem-bench-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .lesson-progress {
    justify-items: start;
  }

  .lesson-progress span {
    font-size: 1.6rem;
  }

  .setup-grid,
  .assembly-grid,
  .teacher-check {
    grid-template-columns: 1fr;
  }

  .length-card {
    grid-column: auto;
  }

  .setup-grid input,
  .setup-grid select,
  .orientation-control,
  .override-field input,
  .next-stem {
    min-height: 56px;
  }

  .stem-bench,
  .teacher-setup,
  .teacher-check {
    padding: 20px;
  }

  .checkpoint-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .checkpoint-grid button:last-child {
    grid-column: 1 / -1;
  }
}

.adaptive-canvas {
  display: grid;
  min-width: 0;
  overflow: hidden;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.adaptive-header {
  display: flex;
  gap: 24px;
  align-items: end;
  justify-content: space-between;
  padding: clamp(26px, 4vw, 48px);
  color: var(--paper);
  background: var(--ink-deep);
}

.adaptive-header h3 {
  margin: 0;
  font-family: Georgia, serif;
  font-size: clamp(2.8rem, 6vw, 5.6rem);
  font-weight: 400;
  letter-spacing: -0.055em;
  line-height: 0.9;
}

.adaptive-header p:not(.eyebrow) {
  margin: 10px 0 0;
  color: #c6d8d1;
}

.adaptive-header .source-boundary {
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.adaptive-header > span {
  font-family: Georgia, serif;
  font-size: 1.2rem;
  white-space: nowrap;
}

.role-track {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  background: #eef2ec;
  border-bottom: 1px solid var(--line);
}

.role-track li {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: center;
  min-width: 0;
  padding: 12px 16px;
  color: #66736e;
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-right: 1px solid var(--line);
  border-bottom: 4px solid transparent;
}

.role-track li:last-child {
  border-right: 0;
}

.role-track button {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0;
  cursor: pointer;
  color: inherit;
  background: transparent;
  border: 0;
  font: inherit;
  font-weight: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
}

.role-track li.is-complete,
.role-track li.is-current {
  color: var(--ink-deep);
}

.role-track li.is-current {
  background: #fffdf8;
  border-bottom-color: var(--stem);
}

.role-track i {
  display: grid;
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  place-items: center;
  color: #fff;
  font-style: normal;
  background: var(--stem);
  border-radius: 50%;
}

.step-track {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--line);
}

.step-track li {
  display: flex;
  gap: 9px;
  align-items: center;
  min-width: 0;
  padding: 16px;
  color: var(--muted);
  border-right: 1px solid var(--line);
  font-size: 0.7rem;
}

.step-track li:last-child {
  border-right: 0;
}

.step-track button {
  display: flex;
  gap: 9px;
  align-items: center;
  width: 100%;
  padding: 0;
  cursor: pointer;
  color: inherit;
  background: transparent;
  border: 0;
  font: inherit;
}

.step-track i {
  display: grid;
  width: 24px;
  height: 24px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  font-family: Georgia, serif;
  font-style: normal;
}

.step-track .is-current {
  color: var(--ink);
  background: #e6eee9;
}

.step-track .is-current i,
.step-track .is-complete i {
  color: #fff;
  background: var(--ink);
  border-color: var(--ink);
}

.adaptive-stage {
  display: grid;
  grid-template-columns: minmax(260px, 0.42fr) minmax(0, 0.58fr);
  width: 100%;
  height: 560px;
  min-width: 0;
  overflow: hidden;
}

.adaptive-copy,
.adaptive-visual {
  min-width: 0;
  min-height: 0;
  padding: clamp(28px, 5vw, 64px);
  overflow: auto;
}

.adaptive-copy {
  align-content: center;
  background: var(--paper);
}

.adaptive-copy h4 {
  margin: 0;
  font-family: Georgia, serif;
  font-size: clamp(2rem, 3.5vw, 3.8rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 1;
}

.adaptive-copy > p {
  max-width: 34rem;
  margin: 20px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.adaptive-visual {
  display: grid;
  place-items: center;
  color: var(--paper);
  background: var(--ink);
}

.adaptive-visual svg,
.focus-diagram {
  display: block;
  width: min(100%, 560px);
  max-height: 510px;
}

.compact-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 34px;
}

.compact-fields label,
.inline-override {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 0.65rem;
  font-weight: 750;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.compact-fields input,
.compact-fields select,
.inline-override input {
  width: 100%;
  min-height: 50px;
  padding: 10px 12px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 1rem;
}

.length-visual {
  align-content: center;
  gap: 42px;
}

.measure-stem {
  position: relative;
  display: grid;
  width: min(90%, 470px);
  min-height: 310px;
  place-items: center;
}

.measure-stem i {
  position: absolute;
  width: 8px;
  height: 250px;
  background: var(--role-color);
  border-radius: 999px;
}

.measure-stem::before,
.measure-stem::after {
  position: absolute;
  left: calc(50% + 28px);
  width: 32px;
  height: 1px;
  content: "";
  background: var(--focus);
}

.measure-stem::before { top: 30px; }
.measure-stem::after { bottom: 30px; }

.measure-stem .length-value {
  position: absolute;
  left: calc(50% + 74px);
  padding: 8px 12px;
  color: var(--ink-deep);
  background: var(--focus);
  border-radius: 999px;
  font-family: Georgia, serif;
  font-size: 1.45rem;
  white-space: nowrap;
}

.length-ratio {
  position: absolute;
  right: calc(50% + 28px);
  padding: 7px 10px;
  color: #fff1c9;
  border: 1px solid rgba(255, 241, 201, 0.55);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  white-space: nowrap;
}

.inline-override {
  width: min(90%, 360px);
  color: #b6c9c2;
}

.inline-override span {
  color: #b6c9c2;
  font-size: 0.65rem;
}

.kenzan-focus svg {
  width: min(100%, 500px);
}

.kenzan-container {
  fill: #d8e9e3;
  fill-opacity: 0.12;
  stroke: #fff1c9;
  stroke-width: 1.4;
}

.kenzan-label,
.kenzan-location-label {
  fill: #fff1c9;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.kenzan-label {
  font-size: 4px;
}

.kenzan-location-label {
  font-size: 3.4px;
}

.placed-stem line {
  stroke: var(--stem);
  stroke-width: 2.2;
  stroke-linecap: round;
}

.placed-stem circle {
  fill: var(--stem);
  stroke: #fff1c9;
  stroke-width: 1;
}

.placed-stem text {
  fill: #fff1c9;
  font-size: 3.5px;
  font-weight: 850;
  letter-spacing: 0.04em;
}

.kenzan-measure line {
  stroke: var(--focus);
  stroke-width: 0.8;
  stroke-dasharray: 2 2;
}

.kenzan-measure text {
  fill: var(--focus);
  font-size: 4px;
  font-weight: 800;
}

.reference-axis {
  stroke: #91aaa1;
  stroke-width: 1;
  stroke-dasharray: 3 2;
}

.focus-stem {
  stroke: var(--role-color);
  stroke-width: 3;
  stroke-linecap: round;
}

.focus-origin {
  fill: var(--role-color);
}

.angle-arc {
  fill: none;
  stroke: var(--focus);
  stroke-width: 1.6;
}

.angle-label {
  fill: var(--focus);
  font-family: Georgia, serif;
  font-size: 7px;
  font-weight: 700;
}

.step-reading {
  display: grid;
  gap: 5px;
  margin-top: 32px;
}

.step-reading strong {
  color: var(--role-color);
  font-family: Georgia, serif;
  font-size: 3.4rem;
  font-weight: 400;
}

.step-reading span {
  color: var(--muted);
  font-size: 0.72rem;
  text-transform: uppercase;
}

.review-values {
  display: grid;
  gap: 1px;
  margin-top: 34px;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 14px;
}

.review-values div {
  display: flex;
  justify-content: space-between;
  padding: 12px 14px;
  background: var(--card);
}

.review-values dt {
  color: var(--muted);
}

.review-values dd {
  margin: 0;
  font-weight: 750;
}

.review-visual > svg {
  width: min(100%, 600px);
}

.annotation-toggle {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 22px;
  color: var(--ink-deep);
  font-weight: 750;
}

.annotation-toggle input {
  width: 20px;
  height: 20px;
  accent-color: var(--ink);
}

.annotation-leader {
  stroke: #fff1c9;
  stroke-width: 0.8;
}

.annotation-plate {
  fill: #0d2924;
  stroke: var(--stem);
  stroke-width: 0.8;
}

.placement-label {
  fill: #fff1c9;
  font-size: 3.2px;
  font-weight: 750;
  letter-spacing: 0.01em;
}

.adaptive-nav {
  position: sticky;
  z-index: 5;
  bottom: 0;
  display: grid;
  grid-template-columns: minmax(120px, 0.4fr) 1fr minmax(120px, 0.4fr);
  gap: 10px;
  align-items: center;
  padding: 14px;
  background: rgba(251, 249, 244, 0.96);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.adaptive-nav button {
  min-height: 54px;
  padding: 10px 18px;
  cursor: pointer;
  color: #fff;
  background: var(--ink);
  border: 0;
  border-radius: 12px;
  font-weight: 750;
}

.adaptive-nav button:disabled {
  cursor: not-allowed;
  color: var(--muted);
  background: var(--paper-warm);
}

.adaptive-nav > span {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-align: center;
  text-transform: uppercase;
}

@media (max-width: 700px) {
  .adaptive-canvas {
    width: 100%;
    overflow: visible;
    border-radius: 20px;
  }

  body[data-mode="lesson"] .workspace {
    padding-bottom: 92px;
  }

  body[data-mode="lesson"] .adaptive-nav {
    position: fixed;
    right: 16px;
    bottom: calc(12px + env(safe-area-inset-bottom));
    left: 16px;
    border: 1px solid var(--line);
    border-radius: 16px;
    box-shadow: 0 12px 36px rgba(13, 41, 36, 0.2);
  }

  .adaptive-header {
    align-items: flex-start;
    padding: 24px 20px;
  }

  .adaptive-header h3 {
    font-size: 3rem;
  }

  .role-track button,
  .step-track button {
    min-height: 44px;
  }

  .step-track {
    overflow-x: auto;
  }

  .step-track,
  .table-wrap {
    scrollbar-width: none;
  }

  .step-track::-webkit-scrollbar,
  .table-wrap::-webkit-scrollbar {
    display: none;
  }

  .step-track li {
    min-width: 58px;
    justify-content: center;
    padding: 11px 8px;
  }

  .step-track li span {
    display: none;
  }

  .adaptive-stage {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(330px, auto) minmax(390px, auto);
    height: auto;
    min-height: 720px;
    overflow: visible;
  }

  .adaptive-copy,
  .adaptive-visual {
    padding: 28px 20px;
    overflow: visible;
  }

  .adaptive-visual {
    min-height: 390px;
  }

  .compact-fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .compact-fields label:last-child {
    grid-column: 1 / -1;
  }

  .measure-stem {
    min-height: 280px;
  }

  .adaptive-nav {
    grid-template-columns: minmax(88px, 0.5fr) minmax(0, 1fr);
  }

  .adaptive-nav > span {
    display: none;
  }

  .adaptive-nav button {
    min-width: 0;
    padding-inline: 10px;
    font-size: 0.74rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}